added copyright notice to xkcd-fetch.py
added copyright notice to xkcd-fetch.py

the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project,the-xkcd-community/the-red-spider-project